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ASIC Physical Design:: transition values in libraries

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smatit

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In the timing libraries used in ASIC sta the transition tables are normally extrapolated to 10%~90%. WHY?

The delay calculator has to again multiply the values in transition table by slew_derate_from_library to get the transition_value for the actual characterised portion of the waveform and use it for delay calculation.
Why in first place the actual transition values for the characterised say 30%~70% not written in the libraries?
Could some one help me understand?
 
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